This is because it's illegal to require a Canadian to provide their SIN, unless the use is on the list of exceptions [1]. One can still ask a Canadian for thei

This is because it's illegal to require a Canadian to provide their SIN, unless the use is on the list of exceptions [1]. One can still ask a Canadian for their SIN for reasons not on that list, but it is illegal to refuse service for not providing a SIN [2]. [1] https://www.canada.ca/en/employment-social-development/services/sin/reports/code-of-practice/annex-2.html https://www.canada.ca/en/employment-social-development/servi... [2] https://www.canada.ca/en/employment-social-development/programs/sin/protect.html#a4 https://www.canada.ca/en/employment-social-development/progr...